In the event of fire, the alarm will sound at______of 10 seconds.

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问题 In the event of fire, the alarm will sound at______of 10 seconds.

选项 A、intervals
B、rates
C、gaps
D、lengths

答案A

解析 interval指“(时间、空间的)间隔,间距”,如:Trees are planted at intervals of 3 meters.每隔3米种一棵树。 “at intervals of”是固定词组,再如:at intervals of 20 minutes=at 20-minute intervals每隔20分钟。
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